Test integer exponentiation in a const context

Author: ecstatic-morse

src/test/ui/consts/const-int-pow-rpass.rs

@@ -1,11 +1,48 @@
 // run-pass
 
+#![feature(const_int_pow)]
+#![feature(wrapping_next_power_of_two)]
+
 const IS_POWER_OF_TWO_A: bool = 0u32.is_power_of_two();
 const IS_POWER_OF_TWO_B: bool = 32u32.is_power_of_two();
 const IS_POWER_OF_TWO_C: bool = 33u32.is_power_of_two();
 
+const POW: u8 = 3u8.pow(5);
+
+const CHECKED_POW_OK: Option<u8> = 3u8.checked_pow(5);
+const CHECKED_POW_OVERFLOW: Option<u8> = 3u8.checked_pow(6);
+
+const WRAPPING_POW: u8 = 3u8.wrapping_pow(6);
+const OVERFLOWING_POW: (u8, bool) = 3u8.overflowing_pow(6);
+const SATURATING_POW: u8 = 3u8.saturating_pow(6);
+
+const NEXT_POWER_OF_TWO: u32 = 3u32.next_power_of_two();
+
+const CHECKED_NEXT_POWER_OF_TWO_OK: Option<u32> = 3u32.checked_next_power_of_two();
+const CHECKED_NEXT_POWER_OF_TWO_OVERFLOW: Option<u32> =
+    u32::max_value().checked_next_power_of_two();
+
+const WRAPPING_NEXT_POWER_OF_TWO: u32 =
+    u32::max_value().wrapping_next_power_of_two();
+
 fn main() {
     assert!(!IS_POWER_OF_TWO_A);
     assert!(IS_POWER_OF_TWO_B);
     assert!(!IS_POWER_OF_TWO_C);
+
+    assert_eq!(POW, 243);
+
+    assert_eq!(CHECKED_POW_OK, Some(243));
+    assert_eq!(CHECKED_POW_OVERFLOW, None);
+
+    assert_eq!(WRAPPING_POW, 217);
+    assert_eq!(OVERFLOWING_POW, (217, true));
+    assert_eq!(SATURATING_POW, u8::max_value());
+
+    assert_eq!(NEXT_POWER_OF_TWO, 4);
+
+    assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OK, Some(4));
+    assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OVERFLOW, None);
+
+    assert_eq!(WRAPPING_NEXT_POWER_OF_TWO, 0);
 }